1.华北水利水电大学测绘与地理信息学院,河南 郑州,450046
2.武汉大学测绘学院,湖北 武汉,430079
3.武汉大学地球空间环境与大地测量教育部重点实验室,湖北 武汉,430079
杨九元,博士,讲师,主要从事大地测量反演与构造形变研究。jyyang@whu.edu.cn
温扬茂,博士,教授。ymwen@sgg.whu.edu.cn
收稿:2024-01-02,
纸质出版:2025-02-05
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杨九元,温扬茂,许才军.InSAR观测揭示的2023年甘肃积石山Ms 6.2地震发震构造[J].武汉大学学报(信息科学版),2025,50(2):313-321.
YANG Jiuyuan,WEN Yangmao,XU Caijun.Seismogenic Fault Structure of the 2023 Ms 6.2 Jishishan (Gansu,China) Earthquake Revealed by InSAR Observations[J].Geomatics and Information Science of Wuhan University,2025,50(2):313-321.
杨九元,温扬茂,许才军.InSAR观测揭示的2023年甘肃积石山Ms 6.2地震发震构造[J].武汉大学学报(信息科学版),2025,50(2):313-321. DOI:10.13203/j.whugis20230501
YANG Jiuyuan,WEN Yangmao,XU Caijun.Seismogenic Fault Structure of the 2023 Ms 6.2 Jishishan (Gansu,China) Earthquake Revealed by InSAR Observations[J].Geomatics and Information Science of Wuhan University,2025,50(2):313-321. DOI:10.13203/j.whugis20230501
2023-12-18,中国甘肃省临夏回族自治州积石山县发生了Ms 6.2地震。作为该区域自地震观测记录以来发生的最大地震,此次事件为深入理解区域发震构造及破裂行为提供了宝贵的机会。利用哨兵1A卫星的合成孔径雷达干涉测量(interferometric synthetic aperture radar
InSAR)数据提取了此次地震的同震地表形变,并调查了该地震的发震断层结构。大地测量反演结果显示:西南倾和东北倾发震断层模型均能较好地拟合同震InSAR观测数据。通过对余震序列、区域断层构造特性和同震干涉图的综合分析,认为此次地震破裂在东北倾的发震断层上,可能为拉脊山南缘断裂的一个隐伏分支断层。同震库仑应力变化表明,拉脊山北缘断裂东分支断层中段、拉脊山南缘断裂东分支断层南段和西秦岭北缘断裂西段具有较高的地震危险性。
Objectives
2
On December 18
2023
an Ms 6.2 earthquake struck the Jishishan County
Gansu Province
China. As the largest earthquake to hit this region since seismic record
the 2023 Jishishan earthquake provides an opportunity to improve our understanding of the seismogenic structure and rupture behavior of the regional active fault.
Methods
2
We utilize Sentinel-1A interferometric synthetic aperture radar (InSAR) data to extract the coseismic surface deformation associated with this earthquake and investigate the seismogenic fault structure.
Results and Conclusions
2
Geodetic inversion result shows that both the SW-dipping and NE-dipping fault models can fit the coseismic InSAR observations better. By a joint analysis of the aftershocks
regional fault kinematics and coseismic interferograms
we infer that the 2023 Jishishan earthquake ruptured the NE-dipping seismogenic fault
which may be a buried branch fault belonging to the south Laji Mountain fault. Coseismic Coulomb stress changes indicate a high seismic risk at the middle segment of the eastern branch fault of the north Laji Mountain fault
the southern segment of the eastern branch fault of the south Laji Mountain fault and the western segment of the northern margin of the western Qinling fault.
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